Contacts of the helix formed by residues 258 - 263 (chain B) in PDB entry 2I99
Residue contacts within the protein are
derived with the CSU software (Sobolev V., Sorokine A.,
Prilusky J., Abola E.E. and Edelman M. (1999) Automated
analysis of interatomic contacts in proteins.
Bioinformatics, 15, 327-332). A
short description of the analytical approach
is given at the end of the page.
Note:
Non-standard 3 letter residue
codes indicate a heterogroup. To identify
and analyse, use LPC software
Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC - hydrophobic-hydrophilic contact (destabilizing contact)
+/- - indicates presence/absence of a specific contacts
* - indicates residues forming contacts by their side chain
(including CA atoms)
Residues in contact with SER 258 (chain B).
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
228B ALA 4.3 5.6 + - - -
230B ARG 4.3 0.2 - - - -
231B PRO* 4.1 1.6 - - - -
253B ALA 4.1 0.2 + - - -
254B ALA* 2.9 19.8 + - - +
256B LYS 4.0 0.2 - - - -
257B GLU* 1.3 75.7 - - - +
259B GLY* 1.3 57.3 + - - +
260B ASP* 3.3 11.1 + - - +
261B VAL* 2.9 33.3 + - - +
262B LEU* 2.8 33.0 + - - +
291B LYS* 3.7 23.7 + - - -
293B LEU* 4.5 3.4 - - - -
----------------------------------------------------------
Back to top of page
Residues in contact with GLY 259 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
228B ALA 4.3 1.2 + - - -
230B ARG 3.0 14.2 + - - -
231B PRO* 3.6 23.1 - - - +
233B TRP 3.2 17.9 + - - -
234B ARG* 3.9 4.9 - - - -
258B SER* 1.3 72.5 - - - +
260B ASP* 1.3 58.0 + - - +
262B LEU* 4.4 0.2 - - - -
263B LEU* 2.7 40.2 + - - +
----------------------------------------------------------
Back to top of page
Residues in contact with ASP 260 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
228B ALA* 3.5 17.7 - - - +
233B TRP 3.5 2.0 + - - -
234B ARG* 3.2 15.4 - - - +
235B GLU* 2.8 36.6 + - - +
236B LEU* 2.8 25.3 + - + +
241B MET* 3.5 22.3 - - + +
258B SER* 3.1 7.9 + - - +
259B GLY* 1.3 76.7 - - - +
261B VAL* 1.3 58.3 + - + +
264B SER* 2.8 28.4 + - - -
291B LYS* 3.8 17.7 + - - -
----------------------------------------------------------
Back to top of page
Residues in contact with VAL 261 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
241B MET* 4.2 6.7 - - + -
246B LEU* 4.0 19.5 - - + -
248B VAL* 4.9 1.3 - - + -
254B ALA* 4.3 12.6 - - + +
255B LEU* 4.3 23.1 - - + -
258B SER* 2.9 30.6 + - - +
260B ASP* 1.3 77.8 - - + +
262B LEU* 1.3 59.8 + - + +
264B SER* 4.1 1.1 - - - -
265B GLY* 3.0 23.0 + - - -
266B ALA 3.3 22.2 + - - +
268B ILE* 4.4 12.6 - - + -
291B LYS* 4.2 16.2 - - + -
----------------------------------------------------------
Back to top of page
Residues in contact with LEU 262 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
231B PRO* 3.8 31.6 - - + +
254B ALA 4.3 3.4 - - - +
255B LEU* 3.4 43.5 - - + +
256B LYS 4.4 5.4 - - - +
258B SER 2.8 20.9 + - - +
261B VAL* 1.3 70.6 - - - +
263B LEU* 1.3 69.4 + - + +
264B SER 3.1 1.3 - - - -
265B GLY* 2.9 20.4 + - - -
----------------------------------------------------------
Back to top of page
Residues in contact with LEU 263 (chain B).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
231B PRO 3.1 27.4 - - - +
232B ASP* 4.5 15.9 - - + +
234B ARG* 3.7 37.5 + - + +
238B ASP* 4.0 2.1 - - - +
259B GLY* 2.7 23.3 + - - +
262B LEU* 1.3 76.7 - - + +
264B SER* 1.3 56.2 + - - +
----------------------------------------------------------
Back to top of page
A short description of the
analytical approach
The contact analysis used in this page
is based upon the approach
developed in:
Sobolev V., Wade R.C., Vriend G.
and Edelman M. PROTEINS (1996)
25, 120-129.
Contact legitimacy depends on the hydrophobic-hydrophilic
properties of the contacting atoms. In order to
define it, for each inter-atomic contact,
eight atom classes have been introduced:
I Hydrophilic - N and O that can donate and accept hydrogen bonds
(e.g., oxygen of hydroxyl group of Ser. or Thr)
II Acceptor - N or O that can only accept a hydrogen bond
III Donor - N that can only donate a hydrogen bond
IV Hydrophobic - Cl, Br, I and all C atoms that are not in
aromatic rings and do not have a covalent bond to
a N or O atom
V Aromatic - C in aromatic rings irrespective of any other
bonds formed by the atom
VI Neutral - C atoms that have a covalent bond to at least one
atom of class I or two or more atoms from class II
or III; atoms; S, F, P, and metal atoms in all cases
VII Neutral-donor - C atoms that have a covalent bond with only one
atom of class III
VIII Neutral-acceptor - C atoms that have a covalent bond with only
one atom of class II
For each pair of contacts the state of legitimacy
is shown below:
Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
Atomic class I II III IV V VI VII VIII
------------------------------------------------------------
I (Hydrophilic) + + + - + + + +
II (Acceptor) + - + - + + + -
III (Donor) + + - - + + - +
IV (Hydrophobic) - - - + + + + +
V (Aromatic) + + + + + + + +
VI (Neutral) + + + + + + + +
VII (Neutral-donor) + + - + + + - +
VIII (Neutral-acceptor) + - + + + + + -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically
assigned based on the atomic coordinates. However, in
three cases (see below) the automatic assignment
is currently ambiguous. In these
cases, the user is advised to manually analyse
the full list of contacts using
LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are
considered "aromatic" (Class V) if the ring is approximately
planar, and "hydrophobic" (Class IV) or "neutral" (Classes
VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
"hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
"carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).
Please E-mail any
questions and/or suggestions concerning this page to
Vladimir.Sobolev@weizmann.ac.il